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cpython/PC/launcher2.c

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/*
* Rewritten Python launcher for Windows
*
* This new rewrite properly handles PEP 514 and allows any registered Python
* runtime to be launched. It also enables auto-install of versions when they
* are requested but no installation can be found.
*/
#define __STDC_WANT_LIB_EXT1__ 1
#include <windows.h>
#include <pathcch.h>
#include <fcntl.h>
#include <io.h>
#include <shlobj.h>
#include <stdio.h>
#include <stdbool.h>
#include <tchar.h>
#include <assert.h>
#define MS_WINDOWS
#include "patchlevel.h"
#define MAXLEN PATHCCH_MAX_CCH
#define MSGSIZE 1024
#define RC_NO_STD_HANDLES 100
#define RC_CREATE_PROCESS 101
#define RC_BAD_VIRTUAL_PATH 102
#define RC_NO_PYTHON 103
#define RC_NO_MEMORY 104
#define RC_NO_SCRIPT 105
#define RC_NO_VENV_CFG 106
#define RC_BAD_VENV_CFG 107
#define RC_NO_COMMANDLINE 108
#define RC_INTERNAL_ERROR 109
#define RC_DUPLICATE_ITEM 110
#define RC_INSTALLING 111
#define RC_NO_PYTHON_AT_ALL 112
#define RC_NO_SHEBANG 113
#define RC_RECURSIVE_SHEBANG 114
static FILE * log_fp = NULL;
void
debug(wchar_t * format, ...)
{
va_list va;
if (log_fp != NULL) {
wchar_t buffer[MAXLEN];
int r = 0;
va_start(va, format);
r = vswprintf_s(buffer, MAXLEN, format, va);
va_end(va);
if (r <= 0) {
return;
}
fputws(buffer, log_fp);
while (r && isspace(buffer[r])) {
buffer[r--] = L'\0';
}
if (buffer[0]) {
OutputDebugStringW(buffer);
}
}
}
void
formatWinerror(int rc, wchar_t * message, int size)
{
FormatMessageW(
FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS,
NULL, rc, MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
message, size, NULL);
}
void
winerror(int err, wchar_t * format, ... )
{
va_list va;
wchar_t message[MSGSIZE];
wchar_t win_message[MSGSIZE];
int len;
if (err == 0) {
err = GetLastError();
}
va_start(va, format);
len = _vsnwprintf_s(message, MSGSIZE, _TRUNCATE, format, va);
va_end(va);
formatWinerror(err, win_message, MSGSIZE);
if (len >= 0) {
_snwprintf_s(&message[len], MSGSIZE - len, _TRUNCATE, L": %s",
win_message);
}
#if !defined(_WINDOWS)
fwprintf(stderr, L"%s\n", message);
#else
MessageBoxW(NULL, message, L"Python Launcher is sorry to say ...",
MB_OK);
#endif
}
void
error(wchar_t * format, ... )
{
va_list va;
wchar_t message[MSGSIZE];
va_start(va, format);
_vsnwprintf_s(message, MSGSIZE, _TRUNCATE, format, va);
va_end(va);
#if !defined(_WINDOWS)
fwprintf(stderr, L"%s\n", message);
#else
MessageBoxW(NULL, message, L"Python Launcher is sorry to say ...",
MB_OK);
#endif
}
typedef BOOL (*PIsWow64Process2)(HANDLE, USHORT*, USHORT*);
USHORT
_getNativeMachine(void)
{
static USHORT _nativeMachine = IMAGE_FILE_MACHINE_UNKNOWN;
if (_nativeMachine == IMAGE_FILE_MACHINE_UNKNOWN) {
USHORT processMachine;
HMODULE kernel32 = GetModuleHandleW(L"kernel32.dll");
PIsWow64Process2 IsWow64Process2 = kernel32 ?
(PIsWow64Process2)GetProcAddress(kernel32, "IsWow64Process2") :
NULL;
if (!IsWow64Process2) {
BOOL wow64Process;
if (!IsWow64Process(NULL, &wow64Process)) {
winerror(0, L"Checking process type");
} else if (wow64Process) {
// We should always be a 32-bit executable, so if running
// under emulation, it must be a 64-bit host.
_nativeMachine = IMAGE_FILE_MACHINE_AMD64;
} else {
// Not running under emulation, and an old enough OS to not
// have IsWow64Process2, so assume it's x86.
_nativeMachine = IMAGE_FILE_MACHINE_I386;
}
} else if (!IsWow64Process2(NULL, &processMachine, &_nativeMachine)) {
winerror(0, L"Checking process type");
}
}
return _nativeMachine;
}
bool
isAMD64Host(void)
{
return _getNativeMachine() == IMAGE_FILE_MACHINE_AMD64;
}
bool
isARM64Host(void)
{
return _getNativeMachine() == IMAGE_FILE_MACHINE_ARM64;
}
bool
isEnvVarSet(const wchar_t *name)
{
/* only looking for non-empty, which means at least one character
and the null terminator */
return GetEnvironmentVariableW(name, NULL, 0) >= 2;
}
bool
join(wchar_t *buffer, size_t bufferLength, const wchar_t *fragment)
{
if (SUCCEEDED(PathCchCombineEx(buffer, bufferLength, buffer, fragment, PATHCCH_ALLOW_LONG_PATHS))) {
return true;
}
return false;
}
bool
split_parent(wchar_t *buffer, size_t bufferLength)
{
return SUCCEEDED(PathCchRemoveFileSpec(buffer, bufferLength));
}
int
_compare(const wchar_t *x, int xLen, const wchar_t *y, int yLen)
{
// Empty strings sort first
if (!x || !xLen) {
return (!y || !yLen) ? 0 : -1;
} else if (!y || !yLen) {
return 1;
}
switch (CompareStringEx(
LOCALE_NAME_INVARIANT, NORM_IGNORECASE | SORT_DIGITSASNUMBERS,
x, xLen, y, yLen,
NULL, NULL, 0
)) {
case CSTR_LESS_THAN:
return -1;
case CSTR_EQUAL:
return 0;
case CSTR_GREATER_THAN:
return 1;
default:
winerror(0, L"Error comparing '%.*s' and '%.*s' (compare)", xLen, x, yLen, y);
return -1;
}
}
int
_compareArgument(const wchar_t *x, int xLen, const wchar_t *y, int yLen)
{
// Empty strings sort first
if (!x || !xLen) {
return (!y || !yLen) ? 0 : -1;
} else if (!y || !yLen) {
return 1;
}
switch (CompareStringEx(
LOCALE_NAME_INVARIANT, 0,
x, xLen, y, yLen,
NULL, NULL, 0
)) {
case CSTR_LESS_THAN:
return -1;
case CSTR_EQUAL:
return 0;
case CSTR_GREATER_THAN:
return 1;
default:
winerror(0, L"Error comparing '%.*s' and '%.*s' (compareArgument)", xLen, x, yLen, y);
return -1;
}
}
int
_comparePath(const wchar_t *x, int xLen, const wchar_t *y, int yLen)
{
// Empty strings sort first
if (!x || !xLen) {
return !y || !yLen ? 0 : -1;
} else if (!y || !yLen) {
return 1;
}
switch (CompareStringOrdinal(x, xLen, y, yLen, TRUE)) {
case CSTR_LESS_THAN:
return -1;
case CSTR_EQUAL:
return 0;
case CSTR_GREATER_THAN:
return 1;
default:
winerror(0, L"Error comparing '%.*s' and '%.*s' (comparePath)", xLen, x, yLen, y);
return -1;
}
}
bool
_startsWith(const wchar_t *x, int xLen, const wchar_t *y, int yLen)
{
if (!x || !y) {
return false;
}
yLen = yLen < 0 ? (int)wcsnlen_s(y, MAXLEN) : yLen;
xLen = xLen < 0 ? (int)wcsnlen_s(x, MAXLEN) : xLen;
return xLen >= yLen && 0 == _compare(x, yLen, y, yLen);
}
bool
_startsWithArgument(const wchar_t *x, int xLen, const wchar_t *y, int yLen)
{
if (!x || !y) {
return false;
}
yLen = yLen < 0 ? (int)wcsnlen_s(y, MAXLEN) : yLen;
xLen = xLen < 0 ? (int)wcsnlen_s(x, MAXLEN) : xLen;
return xLen >= yLen && 0 == _compareArgument(x, yLen, y, yLen);
}
// Unlike regular startsWith, this function requires that the following
// character is either NULL (that is, the entire string matches) or is one of
// the characters in 'separators'.
bool
_startsWithSeparated(const wchar_t *x, int xLen, const wchar_t *y, int yLen, const wchar_t *separators)
{
if (!x || !y) {
return false;
}
yLen = yLen < 0 ? (int)wcsnlen_s(y, MAXLEN) : yLen;
xLen = xLen < 0 ? (int)wcsnlen_s(x, MAXLEN) : xLen;
if (xLen < yLen) {
return false;
}
if (xLen == yLen) {
return 0 == _compare(x, xLen, y, yLen);
}
return separators &&
0 == _compare(x, yLen, y, yLen) &&
wcschr(separators, x[yLen]) != NULL;
}
/******************************************************************************\
*** HELP TEXT ***
\******************************************************************************/
int
showHelpText(wchar_t ** argv)
{
// The help text is stored in launcher-usage.txt, which is compiled into
// the launcher and loaded at runtime if needed.
//
// The file must be UTF-8. There are two substitutions:
// %ls - PY_VERSION (as wchar_t*)
// %ls - argv[0] (as wchar_t*)
HRSRC res = FindResourceExW(NULL, L"USAGE", MAKEINTRESOURCE(1), MAKELANGID(LANG_NEUTRAL, SUBLANG_NEUTRAL));
HGLOBAL resData = res ? LoadResource(NULL, res) : NULL;
const char *usage = resData ? (const char*)LockResource(resData) : NULL;
if (usage == NULL) {
winerror(0, L"Unable to load usage text");
return RC_INTERNAL_ERROR;
}
DWORD cbData = SizeofResource(NULL, res);
DWORD cchUsage = MultiByteToWideChar(CP_UTF8, 0, usage, cbData, NULL, 0);
if (!cchUsage) {
winerror(0, L"Unable to preprocess usage text");
return RC_INTERNAL_ERROR;
}
cchUsage += 1;
wchar_t *wUsage = (wchar_t*)malloc(cchUsage * sizeof(wchar_t));
cchUsage = MultiByteToWideChar(CP_UTF8, 0, usage, cbData, wUsage, cchUsage);
if (!cchUsage) {
winerror(0, L"Unable to preprocess usage text");
free((void *)wUsage);
return RC_INTERNAL_ERROR;
}
// Ensure null termination
wUsage[cchUsage] = L'\0';
fwprintf(stdout, wUsage, (L"" PY_VERSION), argv[0]);
fflush(stdout);
free((void *)wUsage);
return 0;
}
/******************************************************************************\
*** SEARCH INFO ***
\******************************************************************************/
struct _SearchInfoBuffer {
struct _SearchInfoBuffer *next;
wchar_t buffer[0];
};
typedef struct {
// the original string, managed by the OS
const wchar_t *originalCmdLine;
// pointer into the cmdline to mark what we've consumed
const wchar_t *restOfCmdLine;
// if known/discovered, the full executable path of our runtime
const wchar_t *executablePath;
// pointer and length into cmdline for the file to check for a
// shebang line, if any. Length can be -1 if the string is null
// terminated.
const wchar_t *scriptFile;
int scriptFileLength;
// pointer and length into cmdline or a static string with the
// name of the target executable. Length can be -1 if the string
// is null terminated.
const wchar_t *executable;
int executableLength;
// pointer and length into a string with additional interpreter
// arguments to include before restOfCmdLine. Length can be -1 if
// the string is null terminated.
const wchar_t *executableArgs;
int executableArgsLength;
// pointer and length into cmdline or a static string with the
// company name for PEP 514 lookup. Length can be -1 if the string
// is null terminated.
const wchar_t *company;
int companyLength;
// pointer and length into cmdline or a static string with the
// tag for PEP 514 lookup. Length can be -1 if the string is
// null terminated.
const wchar_t *tag;
int tagLength;
// if true, treats 'tag' as a non-PEP 514 filter
bool oldStyleTag;
// if true, ignores 'tag' when a high priority environment is found
// gh-92817: This is currently set when a tag is read from configuration,
// the environment, or a shebang, rather than the command line, and the
// only currently possible high priority environment is an active virtual
// environment
bool lowPriorityTag;
// if true, allow PEP 514 lookup to override 'executable'
bool allowExecutableOverride;
// if true, allow a nearby pyvenv.cfg to locate the executable
bool allowPyvenvCfg;
// if true, allow defaults (env/py.ini) to clarify/override tags
bool allowDefaults;
// if true, prefer windowed (console-less) executable
bool windowed;
// if true, only list detected runtimes without launching
bool list;
// if true, only list detected runtimes with paths without launching
bool listPaths;
// if true, display help message before continuing
bool help;
// if set, limits search to registry keys with the specified Company
// This is intended for debugging and testing only
const wchar_t *limitToCompany;
// dynamically allocated buffers to free later
struct _SearchInfoBuffer *_buffer;
} SearchInfo;
wchar_t *
allocSearchInfoBuffer(SearchInfo *search, int wcharCount)
{
struct _SearchInfoBuffer *buffer = (struct _SearchInfoBuffer*)malloc(
sizeof(struct _SearchInfoBuffer) +
wcharCount * sizeof(wchar_t)
);
if (!buffer) {
return NULL;
}
buffer->next = search->_buffer;
search->_buffer = buffer;
return buffer->buffer;
}
void
freeSearchInfo(SearchInfo *search)
{
struct _SearchInfoBuffer *b = search->_buffer;
search->_buffer = NULL;
while (b) {
struct _SearchInfoBuffer *nextB = b->next;
free((void *)b);
b = nextB;
}
}
void
_debugStringAndLength(const wchar_t *s, int len, const wchar_t *name)
{
if (!s) {
debug(L"%s: (null)\n", name);
} else if (len == 0) {
debug(L"%s: (empty)\n", name);
} else if (len < 0) {
debug(L"%s: %s\n", name, s);
} else {
debug(L"%s: %.*ls\n", name, len, s);
}
}
void
dumpSearchInfo(SearchInfo *search)
{
if (!log_fp) {
return;
}
#ifdef __clang__
#define DEBUGNAME(s) L # s
#else
#define DEBUGNAME(s) # s
#endif
#define DEBUG(s) debug(L"SearchInfo." DEBUGNAME(s) L": %s\n", (search->s) ? (search->s) : L"(null)")
#define DEBUG_2(s, sl) _debugStringAndLength((search->s), (search->sl), L"SearchInfo." DEBUGNAME(s))
#define DEBUG_BOOL(s) debug(L"SearchInfo." DEBUGNAME(s) L": %s\n", (search->s) ? L"True" : L"False")
DEBUG(originalCmdLine);
DEBUG(restOfCmdLine);
DEBUG(executablePath);
DEBUG_2(scriptFile, scriptFileLength);
DEBUG_2(executable, executableLength);
DEBUG_2(executableArgs, executableArgsLength);
DEBUG_2(company, companyLength);
DEBUG_2(tag, tagLength);
DEBUG_BOOL(oldStyleTag);
DEBUG_BOOL(lowPriorityTag);
DEBUG_BOOL(allowDefaults);
DEBUG_BOOL(allowExecutableOverride);
DEBUG_BOOL(windowed);
DEBUG_BOOL(list);
DEBUG_BOOL(listPaths);
DEBUG_BOOL(help);
DEBUG(limitToCompany);
#undef DEBUG_BOOL
#undef DEBUG_2
#undef DEBUG
#undef DEBUGNAME
}
int
findArgv0Length(const wchar_t *buffer, int bufferLength)
{
// Note: this implements semantics that are only valid for argv0.
// Specifically, there is no escaping of quotes, and quotes within
// the argument have no effect. A quoted argv0 must start and end
// with a double quote character; otherwise, it ends at the first
// ' ' or '\t'.
int quoted = buffer[0] == L'"';
for (int i = 1; bufferLength < 0 || i < bufferLength; ++i) {
switch (buffer[i]) {
case L'\0':
return i;
case L' ':
case L'\t':
if (!quoted) {
return i;
}
break;
case L'"':
if (quoted) {
return i + 1;
}
break;
}
}
return bufferLength;
}
const wchar_t *
findArgv0End(const wchar_t *buffer, int bufferLength)
{
return &buffer[findArgv0Length(buffer, bufferLength)];
}
/******************************************************************************\
*** COMMAND-LINE PARSING ***
\******************************************************************************/
// Adapted from https://stackoverflow.com/a/65583702
typedef struct AppExecLinkFile { // For tag IO_REPARSE_TAG_APPEXECLINK
DWORD reparseTag;
WORD reparseDataLength;
WORD reserved;
ULONG version;
wchar_t stringList[MAX_PATH * 4]; // Multistring (Consecutive UTF-16 strings each ending with a NUL)
/* There are normally 4 strings here. Ex:
Package ID: L"Microsoft.DesktopAppInstaller_8wekyb3d8bbwe"
Entry Point: L"Microsoft.DesktopAppInstaller_8wekyb3d8bbwe!PythonRedirector"
Executable: L"C:\Program Files\WindowsApps\Microsoft.DesktopAppInstaller_1.17.106910_x64__8wekyb3d8bbwe\AppInstallerPythonRedirector.exe"
Applic. Type: L"0" // Integer as ASCII. "0" = Desktop bridge application; Else sandboxed UWP application
*/
} AppExecLinkFile;
int
parseCommandLine(SearchInfo *search)
{
if (!search || !search->originalCmdLine) {
return RC_NO_COMMANDLINE;
}
const wchar_t *argv0End = findArgv0End(search->originalCmdLine, -1);
const wchar_t *tail = argv0End; // will be start of the executable name
const wchar_t *end = argv0End; // will be end of the executable name
search->restOfCmdLine = argv0End; // will be first space after argv0
while (--tail != search->originalCmdLine) {
if (*tail == L'"' && end == argv0End) {
// Move the "end" up to the quote, so we also allow moving for
// a period later on.
end = argv0End = tail;
} else if (*tail == L'.' && end == argv0End) {
end = tail;
} else if (*tail == L'\\' || *tail == L'/') {
++tail;
break;
}
}
if (tail == search->originalCmdLine && tail[0] == L'"') {
++tail;
}
// Without special cases, we can now fill in the search struct
int tailLen = (int)(end ? (end - tail) : wcsnlen_s(tail, MAXLEN));
search->executableLength = -1;
// Our special cases are as follows
#define MATCHES(s) (0 == _comparePath(tail, tailLen, (s), -1))
#define STARTSWITH(s) _startsWith(tail, tailLen, (s), -1)
if (MATCHES(L"py")) {
search->executable = L"python.exe";
search->allowExecutableOverride = true;
search->allowDefaults = true;
} else if (MATCHES(L"pyw")) {
search->executable = L"pythonw.exe";
search->allowExecutableOverride = true;
search->allowDefaults = true;
search->windowed = true;
} else if (MATCHES(L"py_d")) {
search->executable = L"python_d.exe";
search->allowExecutableOverride = true;
search->allowDefaults = true;
} else if (MATCHES(L"pyw_d")) {
search->executable = L"pythonw_d.exe";
search->allowExecutableOverride = true;
search->allowDefaults = true;
search->windowed = true;
} else if (STARTSWITH(L"python3")) {
search->executable = L"python.exe";
search->tag = &tail[6];
search->tagLength = tailLen - 6;
search->allowExecutableOverride = true;
search->oldStyleTag = true;
search->allowPyvenvCfg = true;
} else if (STARTSWITH(L"pythonw3")) {
search->executable = L"pythonw.exe";
search->tag = &tail[7];
search->tagLength = tailLen - 7;
search->allowExecutableOverride = true;
search->oldStyleTag = true;
search->allowPyvenvCfg = true;
search->windowed = true;
} else {
search->executable = tail;
search->executableLength = tailLen;
search->allowPyvenvCfg = true;
}
#undef STARTSWITH
#undef MATCHES
// First argument might be one of our options. If so, consume it,
// update flags and then set restOfCmdLine.
const wchar_t *arg = search->restOfCmdLine;
while(*arg && isspace(*arg)) { ++arg; }
#define MATCHES(s) (0 == _compareArgument(arg, argLen, (s), -1))
#define STARTSWITH(s) _startsWithArgument(arg, argLen, (s), -1)
if (*arg && *arg == L'-' && *++arg) {
tail = arg;
while (*tail && !isspace(*tail)) { ++tail; }
int argLen = (int)(tail - arg);
if (argLen > 0) {
if (STARTSWITH(L"2") || STARTSWITH(L"3")) {
// All arguments starting with 2 or 3 are assumed to be version tags
search->tag = arg;
search->tagLength = argLen;
search->oldStyleTag = true;
search->restOfCmdLine = tail;
} else if (STARTSWITH(L"V:") || STARTSWITH(L"-version:")) {
// Arguments starting with 'V:' specify company and/or tag
const wchar_t *argStart = wcschr(arg, L':') + 1;
const wchar_t *tagStart = wcschr(argStart, L'/') ;
if (tagStart) {
search->company = argStart;
search->companyLength = (int)(tagStart - argStart);
search->tag = tagStart + 1;
} else {
search->tag = argStart;
}
search->tagLength = (int)(tail - search->tag);
search->allowDefaults = false;
search->restOfCmdLine = tail;
} else if (MATCHES(L"0") || MATCHES(L"-list")) {
search->list = true;
search->restOfCmdLine = tail;
} else if (MATCHES(L"0p") || MATCHES(L"-list-paths")) {
search->listPaths = true;
search->restOfCmdLine = tail;
} else if (MATCHES(L"h") || MATCHES(L"-help")) {
search->help = true;
// Do not update restOfCmdLine so that we trigger the help
// message from whichever interpreter we select
}
}
}
#undef STARTSWITH
#undef MATCHES
// Might have a script filename. If it looks like a filename, add
// it to the SearchInfo struct for later reference.
arg = search->restOfCmdLine;
while(*arg && isspace(*arg)) { ++arg; }
if (*arg && *arg != L'-') {
search->scriptFile = arg;
if (*arg == L'"') {
++search->scriptFile;
while (*++arg && *arg != L'"') { }
} else {
while (*arg && !isspace(*arg)) { ++arg; }
}
search->scriptFileLength = (int)(arg - search->scriptFile);
}
return 0;
}
int
_decodeShebang(SearchInfo *search, const char *buffer, int bufferLength, bool onlyUtf8, wchar_t **decoded, int *decodedLength)
{
DWORD cp = CP_UTF8;
int wideLen = MultiByteToWideChar(cp, MB_ERR_INVALID_CHARS, buffer, bufferLength, NULL, 0);
if (!wideLen) {
cp = CP_ACP;
wideLen = MultiByteToWideChar(cp, MB_ERR_INVALID_CHARS, buffer, bufferLength, NULL, 0);
if (!wideLen) {
debug(L"# Failed to decode shebang line (0x%08X)\n", GetLastError());
return RC_BAD_VIRTUAL_PATH;
}
}
wchar_t *b = allocSearchInfoBuffer(search, wideLen + 1);
if (!b) {
return RC_NO_MEMORY;
}
wideLen = MultiByteToWideChar(cp, 0, buffer, bufferLength, b, wideLen + 1);
if (!wideLen) {
debug(L"# Failed to decode shebang line (0x%08X)\n", GetLastError());
return RC_BAD_VIRTUAL_PATH;
}
b[wideLen] = L'\0';
*decoded = b;
*decodedLength = wideLen;
return 0;
}
bool
_shebangStartsWith(const wchar_t *buffer, int bufferLength, const wchar_t *prefix, const wchar_t **rest, int *firstArgumentLength)
{
int prefixLength = (int)wcsnlen_s(prefix, MAXLEN);
if (bufferLength < prefixLength || !_startsWithArgument(buffer, bufferLength, prefix, prefixLength)) {
return false;
}
if (rest) {
*rest = &buffer[prefixLength];
}
if (firstArgumentLength) {
int i = prefixLength;
while (i < bufferLength && !isspace(buffer[i])) {
i += 1;
}
*firstArgumentLength = i - prefixLength;
}
return true;
}
int
ensure_no_redirector_stub(wchar_t* filename, wchar_t* buffer)
{
// Make sure we didn't find a reparse point that will open the Microsoft Store
// If we did, pretend there was no shebang and let normal handling take over
WIN32_FIND_DATAW findData;
HANDLE hFind = FindFirstFileW(buffer, &findData);
if (!hFind) {
// Let normal handling take over
debug(L"# Did not find %s on PATH\n", filename);
return RC_NO_SHEBANG;
}
FindClose(hFind);
if (!(findData.dwFileAttributes & FILE_ATTRIBUTE_REPARSE_POINT &&
findData.dwReserved0 & IO_REPARSE_TAG_APPEXECLINK)) {
return 0;
}
HANDLE hReparsePoint = CreateFileW(buffer, 0, FILE_SHARE_READ, NULL, OPEN_EXISTING, FILE_FLAG_OPEN_REPARSE_POINT, NULL);
if (!hReparsePoint) {
// Let normal handling take over
debug(L"# Did not find %s on PATH\n", filename);
return RC_NO_SHEBANG;
}
AppExecLinkFile appExecLink;
if (!DeviceIoControl(hReparsePoint, FSCTL_GET_REPARSE_POINT, NULL, 0, &appExecLink, sizeof(appExecLink), NULL, NULL)) {
// Let normal handling take over
debug(L"# Did not find %s on PATH\n", filename);
CloseHandle(hReparsePoint);
return RC_NO_SHEBANG;
}
CloseHandle(hReparsePoint);
const wchar_t* redirectorPackageId = L"Microsoft.DesktopAppInstaller_8wekyb3d8bbwe";
if (0 == wcscmp(appExecLink.stringList, redirectorPackageId)) {
debug(L"# ignoring redirector that would launch store\n");
return RC_NO_SHEBANG;
}
return 0;
}
int
searchPath(SearchInfo *search, const wchar_t *shebang, int shebangLength)
{
if (isEnvVarSet(L"PYLAUNCHER_NO_SEARCH_PATH")) {
return RC_NO_SHEBANG;
}
wchar_t *command;
int commandLength;
if (!_shebangStartsWith(shebang, shebangLength, L"/usr/bin/env ", &command, &commandLength)) {
return RC_NO_SHEBANG;
}
if (!commandLength || commandLength == MAXLEN) {
return RC_BAD_VIRTUAL_PATH;
}
int lastDot = commandLength;
while (lastDot > 0 && command[lastDot] != L'.') {
lastDot -= 1;
}
if (!lastDot) {
lastDot = commandLength;
}
wchar_t filename[MAXLEN];
if (wcsncpy_s(filename, MAXLEN, command, commandLength)) {
return RC_BAD_VIRTUAL_PATH;
}
const wchar_t *ext = L".exe";
// If the command already has an extension, we do not want to add it again
if (!lastDot || _comparePath(&filename[lastDot], -1, ext, -1)) {
if (wcscat_s(filename, MAXLEN, L".exe")) {
return RC_BAD_VIRTUAL_PATH;
}
}
debug(L"# Search PATH for %s\n", filename);
wchar_t pathVariable[MAXLEN];
int n = GetEnvironmentVariableW(L"PATH", pathVariable, MAXLEN);
if (!n) {
if (GetLastError() == ERROR_ENVVAR_NOT_FOUND) {
return RC_NO_SHEBANG;
}
winerror(0, L"Failed to read PATH\n", filename);
return RC_INTERNAL_ERROR;
}
wchar_t buffer[MAXLEN];
n = SearchPathW(pathVariable, filename, NULL, MAXLEN, buffer, NULL);
if (!n) {
if (GetLastError() == ERROR_FILE_NOT_FOUND) {
debug(L"# Did not find %s on PATH\n", filename);
// If we didn't find it on PATH, let normal handling take over
return RC_NO_SHEBANG;
}
// Other errors should cause us to break
winerror(0, L"Failed to find %s on PATH\n", filename);
return RC_BAD_VIRTUAL_PATH;
}
int result = ensure_no_redirector_stub(filename, buffer);
if (result) {
return result;
}
// Check that we aren't going to call ourselves again
// If we are, pretend there was no shebang and let normal handling take over
if (GetModuleFileNameW(NULL, filename, MAXLEN) &&
0 == _comparePath(filename, -1, buffer, -1)) {
debug(L"# ignoring recursive shebang command\n");
return RC_RECURSIVE_SHEBANG;
}
wchar_t *buf = allocSearchInfoBuffer(search, n + 1);
if (!buf || wcscpy_s(buf, n + 1, buffer)) {
return RC_NO_MEMORY;
}
search->executablePath = buf;
search->executableArgs = &command[commandLength];
search->executableArgsLength = shebangLength - commandLength;
debug(L"# Found %s on PATH\n", buf);
return 0;
}
int
_readIni(const wchar_t *section, const wchar_t *settingName, wchar_t *buffer, int bufferLength)
{
wchar_t iniPath[MAXLEN];
int n;
if (SUCCEEDED(SHGetFolderPathW(NULL, CSIDL_LOCAL_APPDATA, NULL, 0, iniPath)) &&
join(iniPath, MAXLEN, L"py.ini")) {
debug(L"# Reading from %s for %s/%s\n", iniPath, section, settingName);
n = GetPrivateProfileStringW(section, settingName, NULL, buffer, bufferLength, iniPath);
if (n) {
debug(L"# Found %s in %s\n", settingName, iniPath);
return n;
} else if (GetLastError() == ERROR_FILE_NOT_FOUND) {
debug(L"# Did not find file %s\n", iniPath);
} else {
winerror(0, L"Failed to read from %s\n", iniPath);
}
}
if (GetModuleFileNameW(NULL, iniPath, MAXLEN) &&
SUCCEEDED(PathCchRemoveFileSpec(iniPath, MAXLEN)) &&
join(iniPath, MAXLEN, L"py.ini")) {
debug(L"# Reading from %s for %s/%s\n", iniPath, section, settingName);
n = GetPrivateProfileStringW(section, settingName, NULL, buffer, MAXLEN, iniPath);
if (n) {
debug(L"# Found %s in %s\n", settingName, iniPath);
return n;
} else if (GetLastError() == ERROR_FILE_NOT_FOUND) {
debug(L"# Did not find file %s\n", iniPath);
} else {
winerror(0, L"Failed to read from %s\n", iniPath);
}
}
return 0;
}
bool
_findCommand(SearchInfo *search, const wchar_t *command, int commandLength)
{
wchar_t commandBuffer[MAXLEN];
wchar_t buffer[MAXLEN];
wcsncpy_s(commandBuffer, MAXLEN, command, commandLength);
int n = _readIni(L"commands", commandBuffer, buffer, MAXLEN);
if (!n) {
return false;
}
wchar_t *path = allocSearchInfoBuffer(search, n + 1);
if (!path) {
return false;
}
wcscpy_s(path, n + 1, buffer);
search->executablePath = path;
return true;
}
int
_useShebangAsExecutable(SearchInfo *search, const wchar_t *shebang, int shebangLength)
{
wchar_t buffer[MAXLEN];
wchar_t script[MAXLEN];
wchar_t command[MAXLEN];
int commandLength = 0;
int inQuote = 0;
if (!shebang || !shebangLength) {
return 0;
}
wchar_t *pC = command;
for (int i = 0; i < shebangLength; ++i) {
wchar_t c = shebang[i];
if (isspace(c) && !inQuote) {
commandLength = i;
break;
} else if (c == L'"') {
inQuote = !inQuote;
} else if (c == L'/' || c == L'\\') {
*pC++ = L'\\';
} else {
*pC++ = c;
}
}
*pC = L'\0';
if (!GetCurrentDirectoryW(MAXLEN, buffer) ||
wcsncpy_s(script, MAXLEN, search->scriptFile, search->scriptFileLength) ||
FAILED(PathCchCombineEx(buffer, MAXLEN, buffer, script,
PATHCCH_ALLOW_LONG_PATHS)) ||
FAILED(PathCchRemoveFileSpec(buffer, MAXLEN)) ||
FAILED(PathCchCombineEx(buffer, MAXLEN, buffer, command,
PATHCCH_ALLOW_LONG_PATHS))
) {
return RC_NO_MEMORY;
}
int n = (int)wcsnlen(buffer, MAXLEN);
wchar_t *path = allocSearchInfoBuffer(search, n + 1);
if (!path) {
return RC_NO_MEMORY;
}
wcscpy_s(path, n + 1, buffer);
search->executablePath = path;
if (commandLength) {
search->executableArgs = &shebang[commandLength];
search->executableArgsLength = shebangLength - commandLength;
}
return 0;
}
int
checkShebang(SearchInfo *search)
{
// Do not check shebang if a tag was provided or if no script file
// was found on the command line.
if (search->tag || !search->scriptFile) {
return 0;
}
if (search->scriptFileLength < 0) {
search->scriptFileLength = (int)wcsnlen_s(search->scriptFile, MAXLEN);
}
wchar_t *scriptFile = (wchar_t*)malloc(sizeof(wchar_t) * (search->scriptFileLength + 1));
if (!scriptFile) {
return RC_NO_MEMORY;
}
wcsncpy_s(scriptFile, search->scriptFileLength + 1,
search->scriptFile, search->scriptFileLength);
HANDLE hFile = CreateFileW(scriptFile, GENERIC_READ,
FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE,
NULL, OPEN_EXISTING, 0, NULL);
if (hFile == INVALID_HANDLE_VALUE) {
debug(L"# Failed to open %s for shebang parsing (0x%08X)\n",
scriptFile, GetLastError());
free(scriptFile);
return 0;
}
DWORD bytesRead = 0;
char buffer[4096];
if (!ReadFile(hFile, buffer, sizeof(buffer), &bytesRead, NULL)) {
debug(L"# Failed to read %s for shebang parsing (0x%08X)\n",
scriptFile, GetLastError());
free(scriptFile);
return 0;
}
CloseHandle(hFile);
debug(L"# Read %d bytes from %s to find shebang line\n", bytesRead, scriptFile);
free(scriptFile);
char *b = buffer;
bool onlyUtf8 = false;
if (bytesRead > 3 && *b == 0xEF) {
if (*++b == 0xBB && *++b == 0xBF) {
// Allow a UTF-8 BOM
++b;
bytesRead -= 3;
onlyUtf8 = true;
} else {
debug(L"# Invalid BOM in shebang line");
return 0;
}
}
if (bytesRead <= 2 || b[0] != '#' || b[1] != '!') {
// No shebang (#!) at start of line
debug(L"# No valid shebang line");
return 0;
}
++b;
--bytesRead;
while (--bytesRead > 0 && isspace(*++b)) { }
char *start = b;
while (--bytesRead > 0 && *++b != '\r' && *b != '\n') { }
wchar_t *shebang;
int shebangLength;
// We add 1 when bytesRead==0, as in that case we hit EOF and b points
// to the last character in the file, not the newline
int exitCode = _decodeShebang(search, start, (int)(b - start + (bytesRead == 0)), onlyUtf8, &shebang, &shebangLength);
if (exitCode) {
return exitCode;
}
debug(L"Shebang: %s\n", shebang);
// Handle shebangs that we should search PATH for
int executablePathWasSetByUsrBinEnv = 0;
exitCode = searchPath(search, shebang, shebangLength);
if (exitCode == 0) {
executablePathWasSetByUsrBinEnv = 1;
} else if (exitCode != RC_NO_SHEBANG) {
return exitCode;
}
// Handle some known, case-sensitive shebangs
const wchar_t *command;
int commandLength;
// Each template must end with "python"
static const wchar_t *shebangTemplates[] = {
L"/usr/bin/env python",
L"/usr/bin/python",
L"/usr/local/bin/python",
L"python",
NULL
};
for (const wchar_t **tmpl = shebangTemplates; *tmpl; ++tmpl) {
// Just to make sure we don't mess this up in the future
assert(0 == wcscmp(L"python", (*tmpl) + wcslen(*tmpl) - 6));
if (_shebangStartsWith(shebang, shebangLength, *tmpl, &command, &commandLength)) {
// Search for "python{command}" overrides. All templates end with
// "python", so we prepend it by jumping back 6 characters
if (_findCommand(search, &command[-6], commandLength + 6)) {
search->executableArgs = &command[commandLength];
search->executableArgsLength = shebangLength - commandLength;
debug(L"# Treating shebang command '%.*s' as %s\n",
commandLength + 6, &command[-6], search->executablePath);
return 0;
}
search->tag = command;
search->tagLength = commandLength;
// If we had 'python3.12.exe' then we want to strip the suffix
// off of the tag
if (search->tagLength >= 4) {
const wchar_t *suffix = &search->tag[search->tagLength - 4];
if (0 == _comparePath(suffix, 4, L".exe", -1)) {
search->tagLength -= 4;
}
}
// If we had 'python3_d' then we want to strip the '_d' (any
// '.exe' is already gone)
if (search->tagLength >= 2) {
const wchar_t *suffix = &search->tag[search->tagLength - 2];
if (0 == _comparePath(suffix, 2, L"_d", -1)) {
search->tagLength -= 2;
}
}
search->oldStyleTag = true;
search->lowPriorityTag = true;
search->executableArgs = &command[commandLength];
search->executableArgsLength = shebangLength - commandLength;
if (search->tag && search->tagLength) {
debug(L"# Treating shebang command '%.*s' as 'py -%.*s'\n",
commandLength, command, search->tagLength, search->tag);
} else {
debug(L"# Treating shebang command '%.*s' as 'py'\n",
commandLength, command);
}
return 0;
}
}
// Didn't match a template, but we found it on PATH
if (executablePathWasSetByUsrBinEnv) {
return 0;
}
// Unrecognised executables are first tried as command aliases
commandLength = 0;
while (commandLength < shebangLength && !isspace(shebang[commandLength])) {
commandLength += 1;
}
if (_findCommand(search, shebang, commandLength)) {
search->executableArgs = &shebang[commandLength];
search->executableArgsLength = shebangLength - commandLength;
debug(L"# Treating shebang command '%.*s' as %s\n",
commandLength, shebang, search->executablePath);
return 0;
}
// Unrecognised commands are joined to the script's directory and treated
// as the executable path
return _useShebangAsExecutable(search, shebang, shebangLength);
}
int
checkDefaults(SearchInfo *search)
{
if (!search->allowDefaults) {
return 0;
}
// Only resolve old-style (or absent) tags to defaults
if (search->tag && search->tagLength && !search->oldStyleTag) {
return 0;
}
// If tag is only a major version number, expand it from the environment
// or an ini file
const wchar_t *iniSettingName = NULL;
const wchar_t *envSettingName = NULL;
if (!search->tag || !search->tagLength) {
iniSettingName = L"python";
envSettingName = L"py_python";
} else if (0 == wcsncmp(search->tag, L"3", search->tagLength)) {
iniSettingName = L"python3";
envSettingName = L"py_python3";
} else if (0 == wcsncmp(search->tag, L"2", search->tagLength)) {
iniSettingName = L"python2";
envSettingName = L"py_python2";
} else {
debug(L"# Cannot select defaults for tag '%.*s'\n", search->tagLength, search->tag);
return 0;
}
// First, try to read an environment variable
wchar_t buffer[MAXLEN];
int n = GetEnvironmentVariableW(envSettingName, buffer, MAXLEN);
// If none found, check in our two .ini files instead
if (!n) {
n = _readIni(L"defaults", iniSettingName, buffer, MAXLEN);
}
if (n) {
wchar_t *tag = allocSearchInfoBuffer(search, n + 1);
if (!tag) {
return RC_NO_MEMORY;
}
wcscpy_s(tag, n + 1, buffer);
wchar_t *slash = wcschr(tag, L'/');
if (!slash) {
search->tag = tag;
search->tagLength = n;
search->oldStyleTag = true;
} else {
search->company = tag;
search->companyLength = (int)(slash - tag);
search->tag = slash + 1;
search->tagLength = n - (search->companyLength + 1);
search->oldStyleTag = false;
}
// gh-92817: allow a high priority env to be selected even if it
// doesn't match the tag
search->lowPriorityTag = true;
}
return 0;
}
/******************************************************************************\
*** ENVIRONMENT SEARCH ***
\******************************************************************************/
typedef struct EnvironmentInfo {
/* We use a binary tree and sort on insert */
struct EnvironmentInfo *prev;
struct EnvironmentInfo *next;
/* parent is only used when constructing */
struct EnvironmentInfo *parent;
const wchar_t *company;
const wchar_t *tag;
int internalSortKey;
const wchar_t *installDir;
const wchar_t *executablePath;
const wchar_t *executableArgs;
const wchar_t *architecture;
const wchar_t *displayName;
bool highPriority;
} EnvironmentInfo;
int
copyWstr(const wchar_t **dest, const wchar_t *src)
{
if (!dest) {
return RC_NO_MEMORY;
}
if (!src) {
*dest = NULL;
return 0;
}
size_t n = wcsnlen_s(src, MAXLEN - 1) + 1;
wchar_t *buffer = (wchar_t*)malloc(n * sizeof(wchar_t));
if (!buffer) {
return RC_NO_MEMORY;
}
wcsncpy_s(buffer, n, src, n - 1);
*dest = (const wchar_t*)buffer;
return 0;
}
EnvironmentInfo *
newEnvironmentInfo(const wchar_t *company, const wchar_t *tag)
{
EnvironmentInfo *env = (EnvironmentInfo *)malloc(sizeof(EnvironmentInfo));
if (!env) {
return NULL;
}
memset(env, 0, sizeof(EnvironmentInfo));
int exitCode = copyWstr(&env->company, company);
if (exitCode) {
free((void *)env);
return NULL;
}
exitCode = copyWstr(&env->tag, tag);
if (exitCode) {
free((void *)env->company);
free((void *)env);
return NULL;
}
return env;
}
void
freeEnvironmentInfo(EnvironmentInfo *env)
{
if (env) {
free((void *)env->company);
free((void *)env->tag);
free((void *)env->installDir);
free((void *)env->executablePath);
free((void *)env->executableArgs);
free((void *)env->displayName);
freeEnvironmentInfo(env->prev);
env->prev = NULL;
freeEnvironmentInfo(env->next);
env->next = NULL;
free((void *)env);
}
}
/* Specific string comparisons for sorting the tree */
int
_compareCompany(const wchar_t *x, const wchar_t *y)
{
if (!x && !y) {
return 0;
} else if (!x) {
return -1;
} else if (!y) {
return 1;
}
bool coreX = 0 == _compare(x, -1, L"PythonCore", -1);
bool coreY = 0 == _compare(y, -1, L"PythonCore", -1);
if (coreX) {
return coreY ? 0 : -1;
} else if (coreY) {
return 1;
}
return _compare(x, -1, y, -1);
}
int
_compareTag(const wchar_t *x, const wchar_t *y)
{
if (!x && !y) {
return 0;
} else if (!x) {
return -1;
} else if (!y) {
return 1;
}
// Compare up to the first dash. If not equal, that's our sort order
const wchar_t *xDash = wcschr(x, L'-');
const wchar_t *yDash = wcschr(y, L'-');
int xToDash = xDash ? (int)(xDash - x) : -1;
int yToDash = yDash ? (int)(yDash - y) : -1;
int r = _compare(x, xToDash, y, yToDash);
if (r) {
return r;
}
// If we're equal up to the first dash, we want to sort one with
// no dash *after* one with a dash. Otherwise, a reversed compare.
// This works out because environments are sorted in descending tag
// order, so that higher versions (probably) come first.
// For PythonCore, our "X.Y" structure ensures that higher versions
// come first. Everyone else will just have to deal with it.
if (xDash && yDash) {
return _compare(yDash, -1, xDash, -1);
} else if (xDash) {
return -1;
} else if (yDash) {
return 1;
}
return 0;
}
int
addEnvironmentInfo(EnvironmentInfo **root, EnvironmentInfo* parent, EnvironmentInfo *node)
{
EnvironmentInfo *r = *root;
if (!r) {
*root = node;
node->parent = parent;
return 0;
}
// Sort by company name
switch (_compareCompany(node->company, r->company)) {
case -1:
return addEnvironmentInfo(&r->prev, r, node);
case 1:
return addEnvironmentInfo(&r->next, r, node);
case 0:
break;
}
// Then by tag (descending)
switch (_compareTag(node->tag, r->tag)) {
case -1:
return addEnvironmentInfo(&r->next, r, node);
case 1:
return addEnvironmentInfo(&r->prev, r, node);
case 0:
break;
}
// Then keep the one with the lowest internal sort key
if (node->internalSortKey < r->internalSortKey) {
// Replace the current node
node->parent = r->parent;
if (node->parent) {
if (node->parent->prev == r) {
node->parent->prev = node;
} else if (node->parent->next == r) {
node->parent->next = node;
} else {
debug(L"# Inconsistent parent value in tree\n");
freeEnvironmentInfo(node);
return RC_INTERNAL_ERROR;
}
} else {
// If node has no parent, then it is the root.
*root = node;
}
node->next = r->next;
node->prev = r->prev;
debug(L"# replaced %s/%s/%i in tree\n", node->company, node->tag, node->internalSortKey);
freeEnvironmentInfo(r);
} else {
debug(L"# not adding %s/%s/%i to tree\n", node->company, node->tag, node->internalSortKey);
return RC_DUPLICATE_ITEM;
}
return 0;
}
/******************************************************************************\
*** REGISTRY SEARCH ***
\******************************************************************************/
int
_registryReadString(const wchar_t **dest, HKEY root, const wchar_t *subkey, const wchar_t *value)
{
// Note that this is bytes (hence 'cb'), not characters ('cch')
DWORD cbData = 0;
DWORD flags = RRF_RT_REG_SZ | RRF_RT_REG_EXPAND_SZ;
if (ERROR_SUCCESS != RegGetValueW(root, subkey, value, flags, NULL, NULL, &cbData)) {
return 0;
}
wchar_t *buffer = (wchar_t*)malloc(cbData);
if (!buffer) {
return RC_NO_MEMORY;
}
if (ERROR_SUCCESS == RegGetValueW(root, subkey, value, flags, NULL, buffer, &cbData)) {
*dest = buffer;
} else {
free((void *)buffer);
}
return 0;
}
int
_combineWithInstallDir(const wchar_t **dest, const wchar_t *installDir, const wchar_t *fragment, int fragmentLength)
{
wchar_t buffer[MAXLEN];
wchar_t fragmentBuffer[MAXLEN];
if (wcsncpy_s(fragmentBuffer, MAXLEN, fragment, fragmentLength)) {
return RC_NO_MEMORY;
}
if (FAILED(PathCchCombineEx(buffer, MAXLEN, installDir, fragmentBuffer, PATHCCH_ALLOW_LONG_PATHS))) {
return RC_NO_MEMORY;
}
return copyWstr(dest, buffer);
}
bool
_isLegacyVersion(EnvironmentInfo *env)
{
// Check if backwards-compatibility is required.
// Specifically PythonCore versions 2.X and 3.0 - 3.5 do not implement PEP 514.
if (0 != _compare(env->company, -1, L"PythonCore", -1)) {
return false;
}
int versionMajor, versionMinor;
int n = swscanf_s(env->tag, L"%d.%d", &versionMajor, &versionMinor);
if (n != 2) {
debug(L"# %s/%s has an invalid version tag\n", env->company, env->tag);
return false;
}
return versionMajor == 2
|| (versionMajor == 3 && versionMinor >= 0 && versionMinor <= 5);
}
int
_registryReadLegacyEnvironment(const SearchInfo *search, HKEY root, EnvironmentInfo *env, const wchar_t *fallbackArch)
{
// Backwards-compatibility for PythonCore versions which do not implement PEP 514.
int exitCode = _combineWithInstallDir(
&env->executablePath,
env->installDir,
search->executable,
search->executableLength
);
if (exitCode) {
return exitCode;
}
if (search->windowed) {
exitCode = _registryReadString(&env->executableArgs, root, L"InstallPath", L"WindowedExecutableArguments");
}
else {
exitCode = _registryReadString(&env->executableArgs, root, L"InstallPath", L"ExecutableArguments");
}
if (exitCode) {
return exitCode;
}
if (fallbackArch) {
copyWstr(&env->architecture, fallbackArch);
} else {
DWORD binaryType;
BOOL success = GetBinaryTypeW(env->executablePath, &binaryType);
if (!success) {
return RC_NO_PYTHON;
}
switch (binaryType) {
case SCS_32BIT_BINARY:
copyWstr(&env->architecture, L"32bit");
break;
case SCS_64BIT_BINARY:
copyWstr(&env->architecture, L"64bit");
break;
default:
return RC_NO_PYTHON;
}
}
if (0 == _compare(env->architecture, -1, L"32bit", -1)) {
size_t tagLength = wcslen(env->tag);
if (tagLength <= 3 || 0 != _compare(&env->tag[tagLength - 3], 3, L"-32", 3)) {
const wchar_t *rawTag = env->tag;
wchar_t *realTag = (wchar_t*) malloc(sizeof(wchar_t) * (tagLength + 4));
if (!realTag) {
return RC_NO_MEMORY;
}
int count = swprintf_s(realTag, tagLength + 4, L"%s-32", env->tag);
if (count == -1) {
debug(L"# Failed to generate 32bit tag\n");
free(realTag);
return RC_INTERNAL_ERROR;
}
env->tag = realTag;
free((void*)rawTag);
}
}
wchar_t buffer[MAXLEN];
if (swprintf_s(buffer, MAXLEN, L"Python %s", env->tag)) {
copyWstr(&env->displayName, buffer);
}
return 0;
}
int
_registryReadEnvironment(const SearchInfo *search, HKEY root, EnvironmentInfo *env, const wchar_t *fallbackArch)
{
int exitCode = _registryReadString(&env->installDir, root, L"InstallPath", NULL);
if (exitCode) {
return exitCode;
}
if (!env->installDir) {
return RC_NO_PYTHON;
}
if (_isLegacyVersion(env)) {
return _registryReadLegacyEnvironment(search, root, env, fallbackArch);
}
// If pythonw.exe requested, check specific value
if (search->windowed) {
exitCode = _registryReadString(&env->executablePath, root, L"InstallPath", L"WindowedExecutablePath");
if (!exitCode && env->executablePath) {
exitCode = _registryReadString(&env->executableArgs, root, L"InstallPath", L"WindowedExecutableArguments");
}
}
if (exitCode) {
return exitCode;
}
// Missing windowed path or non-windowed request means we use ExecutablePath
if (!env->executablePath) {
exitCode = _registryReadString(&env->executablePath, root, L"InstallPath", L"ExecutablePath");
if (!exitCode && env->executablePath) {
exitCode = _registryReadString(&env->executableArgs, root, L"InstallPath", L"ExecutableArguments");
}
}
if (exitCode) {
return exitCode;
}
if (!env->executablePath) {
debug(L"# %s/%s has no executable path\n", env->company, env->tag);
return RC_NO_PYTHON;
}
exitCode = _registryReadString(&env->architecture, root, NULL, L"SysArchitecture");
if (exitCode) {
return exitCode;
}
exitCode = _registryReadString(&env->displayName, root, NULL, L"DisplayName");
if (exitCode) {
return exitCode;
}
return 0;
}
int
_registrySearchTags(const SearchInfo *search, EnvironmentInfo **result, HKEY root, int sortKey, const wchar_t *company, const wchar_t *fallbackArch)
{
wchar_t buffer[256];
int err = 0;
int exitCode = 0;
for (int i = 0; exitCode == 0; ++i) {
DWORD cchBuffer = sizeof(buffer) / sizeof(buffer[0]);
err = RegEnumKeyExW(root, i, buffer, &cchBuffer, NULL, NULL, NULL, NULL);
if (err) {
if (err != ERROR_NO_MORE_ITEMS) {
winerror(0, L"Failed to read installs (tags) from the registry");
}
break;
}
HKEY subkey;
if (ERROR_SUCCESS == RegOpenKeyExW(root, buffer, 0, KEY_READ, &subkey)) {
EnvironmentInfo *env = newEnvironmentInfo(company, buffer);
env->internalSortKey = sortKey;
exitCode = _registryReadEnvironment(search, subkey, env, fallbackArch);
RegCloseKey(subkey);
if (exitCode == RC_NO_PYTHON) {
freeEnvironmentInfo(env);
exitCode = 0;
} else if (!exitCode) {
exitCode = addEnvironmentInfo(result, NULL, env);
if (exitCode) {
freeEnvironmentInfo(env);
if (exitCode == RC_DUPLICATE_ITEM) {
exitCode = 0;
}
}
}
}
}
return exitCode;
}
int
registrySearch(const SearchInfo *search, EnvironmentInfo **result, HKEY root, int sortKey, const wchar_t *fallbackArch)
{
wchar_t buffer[256];
int err = 0;
int exitCode = 0;
for (int i = 0; exitCode == 0; ++i) {
DWORD cchBuffer = sizeof(buffer) / sizeof(buffer[0]);
err = RegEnumKeyExW(root, i, buffer, &cchBuffer, NULL, NULL, NULL, NULL);
if (err) {
if (err != ERROR_NO_MORE_ITEMS) {
winerror(0, L"Failed to read distributors (company) from the registry");
}
break;
}
if (search->limitToCompany && 0 != _compare(search->limitToCompany, -1, buffer, cchBuffer)) {
debug(L"# Skipping %s due to PYLAUNCHER_LIMIT_TO_COMPANY\n", buffer);
continue;
}
HKEY subkey;
if (ERROR_SUCCESS == RegOpenKeyExW(root, buffer, 0, KEY_READ, &subkey)) {
exitCode = _registrySearchTags(search, result, subkey, sortKey, buffer, fallbackArch);
RegCloseKey(subkey);
}
}
return exitCode;
}
/******************************************************************************\
*** APP PACKAGE SEARCH ***
\******************************************************************************/
int
appxSearch(const SearchInfo *search, EnvironmentInfo **result, const wchar_t *packageFamilyName, const wchar_t *tag, int sortKey)
{
wchar_t realTag[32];
wchar_t buffer[MAXLEN];
const wchar_t *exeName = search->executable;
if (!exeName || search->allowExecutableOverride) {
exeName = search->windowed ? L"pythonw.exe" : L"python.exe";
}
// Failure to get LocalAppData may just mean we're running as a user who
// doesn't have a profile directory.
// In this case, return "not found", but don't fail.
// Chances are they can't launch Store installs anyway.
if (FAILED(SHGetFolderPathW(NULL, CSIDL_LOCAL_APPDATA, NULL, 0, buffer))) {
return RC_NO_PYTHON;
}
if (!join(buffer, MAXLEN, L"Microsoft\\WindowsApps") ||
!join(buffer, MAXLEN, packageFamilyName) ||
!join(buffer, MAXLEN, exeName)) {
debug(L"# Failed to construct App Execution Alias path\n");
return RC_INTERNAL_ERROR;
}
if (INVALID_FILE_ATTRIBUTES == GetFileAttributesW(buffer)) {
return RC_NO_PYTHON;
}
// Assume packages are native architecture, which means we need to append
// the '-arm64' on ARM64 host.
wcscpy_s(realTag, 32, tag);
if (isARM64Host()) {
wcscat_s(realTag, 32, L"-arm64");
}
EnvironmentInfo *env = newEnvironmentInfo(L"PythonCore", realTag);
if (!env) {
return RC_NO_MEMORY;
}
env->internalSortKey = sortKey;
if (isAMD64Host()) {
copyWstr(&env->architecture, L"64bit");
} else if (isARM64Host()) {
copyWstr(&env->architecture, L"ARM64");
}
copyWstr(&env->executablePath, buffer);
if (swprintf_s(buffer, MAXLEN, L"Python %s (Store)", tag)) {
copyWstr(&env->displayName, buffer);
}
int exitCode = addEnvironmentInfo(result, NULL, env);
if (exitCode) {
freeEnvironmentInfo(env);
if (exitCode == RC_DUPLICATE_ITEM) {
exitCode = 0;
}
}
return exitCode;
}
/******************************************************************************\
*** OVERRIDDEN EXECUTABLE PATH ***
\******************************************************************************/
int
explicitOverrideSearch(const SearchInfo *search, EnvironmentInfo **result)
{
if (!search->executablePath) {
return 0;
}
EnvironmentInfo *env = newEnvironmentInfo(NULL, NULL);
if (!env) {
return RC_NO_MEMORY;
}
env->internalSortKey = 10;
int exitCode = copyWstr(&env->executablePath, search->executablePath);
if (exitCode) {
goto abort;
}
exitCode = copyWstr(&env->displayName, L"Explicit override");
if (exitCode) {
goto abort;
}
exitCode = addEnvironmentInfo(result, NULL, env);
if (exitCode) {
goto abort;
}
return 0;
abort:
freeEnvironmentInfo(env);
if (exitCode == RC_DUPLICATE_ITEM) {
exitCode = 0;
}
return exitCode;
}
/******************************************************************************\
*** ACTIVE VIRTUAL ENVIRONMENT SEARCH ***
\******************************************************************************/
int
virtualenvSearch(const SearchInfo *search, EnvironmentInfo **result)
{
int exitCode = 0;
EnvironmentInfo *env = NULL;
wchar_t buffer[MAXLEN];
int n = GetEnvironmentVariableW(L"VIRTUAL_ENV", buffer, MAXLEN);
if (!n || !join(buffer, MAXLEN, L"Scripts") || !join(buffer, MAXLEN, search->executable)) {
return 0;
}
DWORD attr = GetFileAttributesW(buffer);
if (INVALID_FILE_ATTRIBUTES == attr && search->lowPriorityTag) {
if (!split_parent(buffer, MAXLEN) || !join(buffer, MAXLEN, L"python.exe")) {
return 0;
}
attr = GetFileAttributesW(buffer);
}
if (INVALID_FILE_ATTRIBUTES == attr) {
debug(L"Python executable %s missing from virtual env\n", buffer);
return 0;
}
env = newEnvironmentInfo(NULL, NULL);
if (!env) {
return RC_NO_MEMORY;
}
env->highPriority = true;
env->internalSortKey = 20;
exitCode = copyWstr(&env->displayName, L"Active venv");
if (exitCode) {
goto abort;
}
exitCode = copyWstr(&env->executablePath, buffer);
if (exitCode) {
goto abort;
}
exitCode = addEnvironmentInfo(result, NULL, env);
if (exitCode) {
goto abort;
}
return 0;
abort:
freeEnvironmentInfo(env);
if (exitCode == RC_DUPLICATE_ITEM) {
return 0;
}
return exitCode;
}
/******************************************************************************\
*** COLLECT ENVIRONMENTS ***
\******************************************************************************/
struct RegistrySearchInfo {
// Registry subkey to search
const wchar_t *subkey;
// Registry hive to search
HKEY hive;
// Flags to use when opening the subkey
DWORD flags;
// Internal sort key to select between "identical" environments discovered
// through different methods
int sortKey;
// Fallback value to assume for PythonCore entries missing a SysArchitecture value
const wchar_t *fallbackArch;
};
struct RegistrySearchInfo REGISTRY_SEARCH[] = {
{
L"Software\\Python",
HKEY_CURRENT_USER,
KEY_READ,
1,
NULL
},
{
L"Software\\Python",
HKEY_LOCAL_MACHINE,
KEY_READ | KEY_WOW64_64KEY,
3,
L"64bit"
},
{
L"Software\\Python",
HKEY_LOCAL_MACHINE,
KEY_READ | KEY_WOW64_32KEY,
4,
L"32bit"
},
{ NULL, 0, 0, 0, NULL }
};
struct AppxSearchInfo {
// The package family name. Can be found for an installed package using the
// Powershell "Get-AppxPackage" cmdlet
const wchar_t *familyName;
// The tag to treat the installation as
const wchar_t *tag;
// Internal sort key to select between "identical" environments discovered
// through different methods
int sortKey;
};
struct AppxSearchInfo APPX_SEARCH[] = {
// Releases made through the Store
{ L"PythonSoftwareFoundation.Python.3.14_qbz5n2kfra8p0", L"3.14", 10 },
{ L"PythonSoftwareFoundation.Python.3.13_qbz5n2kfra8p0", L"3.13", 10 },
{ L"PythonSoftwareFoundation.Python.3.12_qbz5n2kfra8p0", L"3.12", 10 },
{ L"PythonSoftwareFoundation.Python.3.11_qbz5n2kfra8p0", L"3.11", 10 },
{ L"PythonSoftwareFoundation.Python.3.10_qbz5n2kfra8p0", L"3.10", 10 },
{ L"PythonSoftwareFoundation.Python.3.9_qbz5n2kfra8p0", L"3.9", 10 },
{ L"PythonSoftwareFoundation.Python.3.8_qbz5n2kfra8p0", L"3.8", 10 },
// Side-loadable releases. Note that the publisher ID changes whenever we
// change our code signing certificate subject, so the newer IDs have higher
// priorities (lower sortKey)
{ L"PythonSoftwareFoundation.Python.3.14_3847v3x7pw1km", L"3.14", 11 },
{ L"PythonSoftwareFoundation.Python.3.13_3847v3x7pw1km", L"3.13", 11 },
{ L"PythonSoftwareFoundation.Python.3.12_3847v3x7pw1km", L"3.12", 11 },
{ L"PythonSoftwareFoundation.Python.3.11_3847v3x7pw1km", L"3.11", 11 },
{ L"PythonSoftwareFoundation.Python.3.11_hd69rhyc2wevp", L"3.11", 12 },
{ L"PythonSoftwareFoundation.Python.3.10_3847v3x7pw1km", L"3.10", 11 },
{ L"PythonSoftwareFoundation.Python.3.10_hd69rhyc2wevp", L"3.10", 12 },
{ L"PythonSoftwareFoundation.Python.3.9_3847v3x7pw1km", L"3.9", 11 },
{ L"PythonSoftwareFoundation.Python.3.9_hd69rhyc2wevp", L"3.9", 12 },
{ L"PythonSoftwareFoundation.Python.3.8_hd69rhyc2wevp", L"3.8", 12 },
{ NULL, NULL, 0 }
};
int
collectEnvironments(const SearchInfo *search, EnvironmentInfo **result)
{
int exitCode = 0;
HKEY root;
EnvironmentInfo *env = NULL;
if (!result) {
debug(L"# collectEnvironments() was passed a NULL result\n");
return RC_INTERNAL_ERROR;
}
*result = NULL;
exitCode = explicitOverrideSearch(search, result);
if (exitCode) {
return exitCode;
}
exitCode = virtualenvSearch(search, result);
if (exitCode) {
return exitCode;
}
// If we aren't collecting all items to list them, we can exit now.
if (env && !(search->list || search->listPaths)) {
return 0;
}
for (struct RegistrySearchInfo *info = REGISTRY_SEARCH; info->subkey; ++info) {
if (ERROR_SUCCESS == RegOpenKeyExW(info->hive, info->subkey, 0, info->flags, &root)) {
exitCode = registrySearch(search, result, root, info->sortKey, info->fallbackArch);
RegCloseKey(root);
}
if (exitCode) {
return exitCode;
}
}
if (search->limitToCompany) {
debug(L"# Skipping APPX search due to PYLAUNCHER_LIMIT_TO_COMPANY\n");
return 0;
}
for (struct AppxSearchInfo *info = APPX_SEARCH; info->familyName; ++info) {
exitCode = appxSearch(search, result, info->familyName, info->tag, info->sortKey);
if (exitCode && exitCode != RC_NO_PYTHON) {
return exitCode;
}
}
return 0;
}
/******************************************************************************\
*** INSTALL ON DEMAND ***
\******************************************************************************/
struct StoreSearchInfo {
// The tag a user is looking for
const wchar_t *tag;
// The Store ID for a package if it can be installed from the Microsoft
// Store. These are obtained from the dashboard at
// https://partner.microsoft.com/dashboard
const wchar_t *storeId;
};
struct StoreSearchInfo STORE_SEARCH[] = {
{ L"3", /* 3.13 */ L"9PNRBTZXMB4Z" },
{ L"3.14", L"9NTRHQCBBPR8" },
{ L"3.13", L"9PNRBTZXMB4Z" },
{ L"3.12", L"9NCVDN91XZQP" },
{ L"3.11", L"9NRWMJP3717K" },
{ L"3.10", L"9PJPW5LDXLZ5" },
{ L"3.9", L"9P7QFQMJRFP7" },
{ L"3.8", L"9MSSZTT1N39L" },
{ NULL, NULL }
};
int
_installEnvironment(const wchar_t *command, const wchar_t *arguments)
{
SHELLEXECUTEINFOW siw = {
sizeof(SHELLEXECUTEINFOW),
SEE_MASK_NOASYNC | SEE_MASK_NOCLOSEPROCESS | SEE_MASK_NO_CONSOLE,
NULL, NULL,
command, arguments, NULL,
SW_SHOWNORMAL
};
debug(L"# Installing with %s %s\n", command, arguments);
if (isEnvVarSet(L"PYLAUNCHER_DRYRUN")) {
debug(L"# Exiting due to PYLAUNCHER_DRYRUN\n");
fflush(stdout);
int mode = _setmode(_fileno(stdout), _O_U8TEXT);
if (arguments) {
fwprintf_s(stdout, L"\"%s\" %s\n", command, arguments);
} else {
fwprintf_s(stdout, L"\"%s\"\n", command);
}
fflush(stdout);
if (mode >= 0) {
_setmode(_fileno(stdout), mode);
}
return RC_INSTALLING;
}
if (!ShellExecuteExW(&siw)) {
return RC_NO_PYTHON;
}
if (!siw.hProcess) {
return RC_INSTALLING;
}
WaitForSingleObjectEx(siw.hProcess, INFINITE, FALSE);
DWORD exitCode = 0;
if (GetExitCodeProcess(siw.hProcess, &exitCode) && exitCode == 0) {
return 0;
}
return RC_INSTALLING;
}
const wchar_t *WINGET_COMMAND = L"Microsoft\\WindowsApps\\Microsoft.DesktopAppInstaller_8wekyb3d8bbwe\\winget.exe";
const wchar_t *WINGET_ARGUMENTS = L"install -q %s --exact --accept-package-agreements --source msstore";
const wchar_t *MSSTORE_COMMAND = L"ms-windows-store://pdp/?productid=%s";
int
installEnvironment(const SearchInfo *search)
{
// No tag? No installing
if (!search->tag || !search->tagLength) {
debug(L"# Cannot install Python with no tag specified\n");
return RC_NO_PYTHON;
}
// PEP 514 tag but not PythonCore? No installing
if (!search->oldStyleTag &&
search->company && search->companyLength &&
0 != _compare(search->company, search->companyLength, L"PythonCore", -1)) {
debug(L"# Cannot install for company %.*s\n", search->companyLength, search->company);
return RC_NO_PYTHON;
}
const wchar_t *storeId = NULL;
for (struct StoreSearchInfo *info = STORE_SEARCH; info->tag; ++info) {
if (0 == _compare(search->tag, search->tagLength, info->tag, -1)) {
storeId = info->storeId;
break;
}
}
if (!storeId) {
return RC_NO_PYTHON;
}
int exitCode;
wchar_t command[MAXLEN];
wchar_t arguments[MAXLEN];
if (SUCCEEDED(SHGetFolderPathW(NULL, CSIDL_LOCAL_APPDATA, NULL, 0, command)) &&
join(command, MAXLEN, WINGET_COMMAND) &&
swprintf_s(arguments, MAXLEN, WINGET_ARGUMENTS, storeId)) {
if (INVALID_FILE_ATTRIBUTES == GetFileAttributesW(command)) {
formatWinerror(GetLastError(), arguments, MAXLEN);
debug(L"# Skipping %s: %s\n", command, arguments);
} else {
fputws(L"Launching winget to install Python. The following output is from the install process\n\
***********************************************************************\n", stdout);
exitCode = _installEnvironment(command, arguments);
if (exitCode == RC_INSTALLING) {
fputws(L"***********************************************************************\n\
Please check the install status and run your command again.", stderr);
return exitCode;
} else if (exitCode) {
return exitCode;
}
fputws(L"***********************************************************************\n\
Install appears to have succeeded. Searching for new matching installs.\n", stdout);
return 0;
}
}
if (swprintf_s(command, MAXLEN, MSSTORE_COMMAND, storeId)) {
fputws(L"Opening the Microsoft Store to install Python. After installation, "
L"please run your command again.\n", stderr);
exitCode = _installEnvironment(command, NULL);
if (exitCode) {
return exitCode;
}
return 0;
}
return RC_NO_PYTHON;
}
/******************************************************************************\
*** ENVIRONMENT SELECT ***
\******************************************************************************/
bool
_companyMatches(const SearchInfo *search, const EnvironmentInfo *env)
{
if (!search->company || !search->companyLength) {
return true;
}
return 0 == _compare(env->company, -1, search->company, search->companyLength);
}
bool
_tagMatches(const SearchInfo *search, const EnvironmentInfo *env, int searchTagLength)
{
if (searchTagLength < 0) {
searchTagLength = search->tagLength;
}
if (!search->tag || !searchTagLength) {
return true;
}
return _startsWithSeparated(env->tag, -1, search->tag, searchTagLength, L".-");
}
bool
_is32Bit(const EnvironmentInfo *env)
{
if (env->architecture) {
return 0 == _compare(env->architecture, -1, L"32bit", -1);
}
return false;
}
int
_selectEnvironment(const SearchInfo *search, EnvironmentInfo *env, EnvironmentInfo **best)
{
int exitCode = 0;
while (env) {
exitCode = _selectEnvironment(search, env->prev, best);
if (exitCode && exitCode != RC_NO_PYTHON) {
return exitCode;
} else if (!exitCode && *best) {
return 0;
}
if (env->highPriority && search->lowPriorityTag) {
// This environment is marked high priority, and the search allows
// it to be selected even though a tag is specified, so select it
// gh-92817: this allows an active venv to be selected even when a
// default tag has been found in py.ini or the environment
*best = env;
return 0;
}
if (!search->oldStyleTag) {
if (_companyMatches(search, env) && _tagMatches(search, env, -1)) {
// Because of how our sort tree is set up, we will walk up the
// "prev" side and implicitly select the "best" best. By
// returning straight after a match, we skip the entire "next"
// branch and won't ever select a "worse" best.
*best = env;
return 0;
}
} else if (0 == _compare(env->company, -1, L"PythonCore", -1)) {
// Old-style tags can only match PythonCore entries
// If the tag ends with -64, we want to exclude 32-bit runtimes
// (If the tag ends with -32, it will be filtered later)
int tagLength = search->tagLength;
bool exclude32Bit = false, only32Bit = false;
if (tagLength > 3) {
if (0 == _compareArgument(&search->tag[tagLength - 3], 3, L"-64", 3)) {
tagLength -= 3;
exclude32Bit = true;
} else if (0 == _compareArgument(&search->tag[tagLength - 3], 3, L"-32", 3)) {
tagLength -= 3;
only32Bit = true;
}
}
if (_tagMatches(search, env, tagLength)) {
if (exclude32Bit && _is32Bit(env)) {
debug(L"# Excluding %s/%s because it looks like 32bit\n", env->company, env->tag);
} else if (only32Bit && !_is32Bit(env)) {
debug(L"# Excluding %s/%s because it doesn't look 32bit\n", env->company, env->tag);
} else {
*best = env;
return 0;
}
}
}
env = env->next;
}
return RC_NO_PYTHON;
}
int
selectEnvironment(const SearchInfo *search, EnvironmentInfo *root, EnvironmentInfo **best)
{
if (!best) {
debug(L"# selectEnvironment() was passed a NULL best\n");
return RC_INTERNAL_ERROR;
}
if (!root) {
*best = NULL;
return RC_NO_PYTHON_AT_ALL;
}
EnvironmentInfo *result = NULL;
int exitCode = _selectEnvironment(search, root, &result);
if (!exitCode) {
*best = result;
}
return exitCode;
}
/******************************************************************************\
*** LIST ENVIRONMENTS ***
\******************************************************************************/
#define TAGWIDTH 16
int
_printEnvironment(const EnvironmentInfo *env, FILE *out, bool showPath, const wchar_t *argument)
{
if (showPath) {
if (env->executablePath && env->executablePath[0]) {
if (env->executableArgs && env->executableArgs[0]) {
fwprintf(out, L" %-*s %s %s\n", TAGWIDTH, argument, env->executablePath, env->executableArgs);
} else {
fwprintf(out, L" %-*s %s\n", TAGWIDTH, argument, env->executablePath);
}
} else if (env->installDir && env->installDir[0]) {
fwprintf(out, L" %-*s %s\n", TAGWIDTH, argument, env->installDir);
} else {
fwprintf(out, L" %s\n", argument);
}
} else if (env->displayName) {
fwprintf(out, L" %-*s %s\n", TAGWIDTH, argument, env->displayName);
} else {
fwprintf(out, L" %s\n", argument);
}
return 0;
}
int
_listAllEnvironments(EnvironmentInfo *env, FILE * out, bool showPath, EnvironmentInfo *defaultEnv)
{
wchar_t buffer[256];
const int bufferSize = 256;
while (env) {
int exitCode = _listAllEnvironments(env->prev, out, showPath, defaultEnv);
if (exitCode) {
return exitCode;
}
if (!env->company || !env->tag) {
buffer[0] = L'\0';
} else if (0 == _compare(env->company, -1, L"PythonCore", -1)) {
swprintf_s(buffer, bufferSize, L"-V:%s", env->tag);
} else {
swprintf_s(buffer, bufferSize, L"-V:%s/%s", env->company, env->tag);
}
if (env == defaultEnv) {
wcscat_s(buffer, bufferSize, L" *");
}
if (buffer[0]) {
exitCode = _printEnvironment(env, out, showPath, buffer);
if (exitCode) {
return exitCode;
}
}
env = env->next;
}
return 0;
}
int
listEnvironments(EnvironmentInfo *env, FILE * out, bool showPath, EnvironmentInfo *defaultEnv)
{
if (!env) {
fwprintf_s(stdout, L"No installed Pythons found!\n");
return 0;
}
/* TODO: Do we want to display these?
In favour, helps users see that '-3' is a good option
Against, repeats the next line of output
SearchInfo majorSearch;
EnvironmentInfo *major;
int exitCode;
if (showPath) {
memset(&majorSearch, 0, sizeof(majorSearch));
majorSearch.company = L"PythonCore";
majorSearch.companyLength = -1;
majorSearch.tag = L"3";
majorSearch.tagLength = -1;
majorSearch.oldStyleTag = true;
major = NULL;
exitCode = selectEnvironment(&majorSearch, env, &major);
if (!exitCode && major) {
exitCode = _printEnvironment(major, out, showPath, L"-3 *");
isDefault = false;
if (exitCode) {
return exitCode;
}
}
majorSearch.tag = L"2";
major = NULL;
exitCode = selectEnvironment(&majorSearch, env, &major);
if (!exitCode && major) {
exitCode = _printEnvironment(major, out, showPath, L"-2");
if (exitCode) {
return exitCode;
}
}
}
*/
int mode = _setmode(_fileno(out), _O_U8TEXT);
int exitCode = _listAllEnvironments(env, out, showPath, defaultEnv);
fflush(out);
if (mode >= 0) {
_setmode(_fileno(out), mode);
}
return exitCode;
}
/******************************************************************************\
*** INTERPRETER LAUNCH ***
\******************************************************************************/
int
calculateCommandLine(const SearchInfo *search, const EnvironmentInfo *launch, wchar_t *buffer, int bufferLength)
{
int exitCode = 0;
const wchar_t *executablePath = NULL;
// Construct command line from a search override, or else the selected
// environment's executablePath
if (search->executablePath) {
executablePath = search->executablePath;
} else if (launch && launch->executablePath) {
executablePath = launch->executablePath;
}
// If we have an executable path, put it at the start of the command, but
// only if the search allowed an override.
// Otherwise, use the environment's installDir and the search's default
// executable name.
if (executablePath && search->allowExecutableOverride) {
if (wcschr(executablePath, L' ') && executablePath[0] != L'"') {
buffer[0] = L'"';
exitCode = wcscpy_s(&buffer[1], bufferLength - 1, executablePath);
if (!exitCode) {
exitCode = wcscat_s(buffer, bufferLength, L"\"");
}
} else {
exitCode = wcscpy_s(buffer, bufferLength, executablePath);
}
} else if (launch) {
if (!launch->installDir) {
fwprintf_s(stderr, L"Cannot launch %s %s because no install directory was specified",
launch->company, launch->tag);
exitCode = RC_NO_PYTHON;
} else if (!search->executable || !search->executableLength) {
fwprintf_s(stderr, L"Cannot launch %s %s because no executable name is available",
launch->company, launch->tag);
exitCode = RC_NO_PYTHON;
} else {
wchar_t executable[256];
wcsncpy_s(executable, 256, search->executable, search->executableLength);
if ((wcschr(launch->installDir, L' ') && launch->installDir[0] != L'"') ||
(wcschr(executable, L' ') && executable[0] != L'"')) {
buffer[0] = L'"';
exitCode = wcscpy_s(&buffer[1], bufferLength - 1, launch->installDir);
if (!exitCode) {
exitCode = join(buffer, bufferLength, executable) ? 0 : RC_NO_MEMORY;
}
if (!exitCode) {
exitCode = wcscat_s(buffer, bufferLength, L"\"");
}
} else {
exitCode = wcscpy_s(buffer, bufferLength, launch->installDir);
if (!exitCode) {
exitCode = join(buffer, bufferLength, executable) ? 0 : RC_NO_MEMORY;
}
}
}
} else {
exitCode = RC_NO_PYTHON;
}
if (!exitCode && launch && launch->executableArgs) {
exitCode = wcscat_s(buffer, bufferLength, L" ");
if (!exitCode) {
exitCode = wcscat_s(buffer, bufferLength, launch->executableArgs);
}
}
if (!exitCode && search->executableArgs) {
if (search->executableArgsLength < 0) {
exitCode = wcscat_s(buffer, bufferLength, search->executableArgs);
} else if (search->executableArgsLength > 0) {
int end = (int)wcsnlen_s(buffer, MAXLEN);
if (end < bufferLength - (search->executableArgsLength + 1)) {
exitCode = wcsncpy_s(&buffer[end], bufferLength - end,
search->executableArgs, search->executableArgsLength);
}
}
}
if (!exitCode && search->restOfCmdLine) {
exitCode = wcscat_s(buffer, bufferLength, search->restOfCmdLine);
}
return exitCode;
}
BOOL
_safeDuplicateHandle(HANDLE in, HANDLE * pout, const wchar_t *nameForError)
{
BOOL ok;
HANDLE process = GetCurrentProcess();
DWORD rc;
*pout = NULL;
ok = DuplicateHandle(process, in, process, pout, 0, TRUE,
DUPLICATE_SAME_ACCESS);
if (!ok) {
rc = GetLastError();
if (rc == ERROR_INVALID_HANDLE) {
debug(L"DuplicateHandle returned ERROR_INVALID_HANDLE\n");
ok = TRUE;
}
else {
winerror(0, L"Failed to duplicate %s handle", nameForError);
}
}
return ok;
}
BOOL WINAPI
ctrl_c_handler(DWORD code)
{
return TRUE; /* We just ignore all control events. */
}
int
launchEnvironment(const SearchInfo *search, const EnvironmentInfo *launch, wchar_t *launchCommand)
{
HANDLE job;
JOBOBJECT_EXTENDED_LIMIT_INFORMATION info;
DWORD rc;
BOOL ok;
STARTUPINFOW si;
PROCESS_INFORMATION pi;
// If this is a dryrun, do not actually launch
if (isEnvVarSet(L"PYLAUNCHER_DRYRUN")) {
debug(L"LaunchCommand: %s\n", launchCommand);
debug(L"# Exiting due to PYLAUNCHER_DRYRUN variable\n");
fflush(stdout);
int mode = _setmode(_fileno(stdout), _O_U8TEXT);
fwprintf(stdout, L"%s\n", launchCommand);
fflush(stdout);
if (mode >= 0) {
_setmode(_fileno(stdout), mode);
}
return 0;
}
#if defined(_WINDOWS)
/*
When explorer launches a Windows (GUI) application, it displays
the "app starting" (the "pointer + hourglass") cursor for a number
of seconds, or until the app does something UI-ish (eg, creating a
window, or fetching a message). As this launcher doesn't do this
directly, that cursor remains even after the child process does these
things. We avoid that by doing a simple post+get message.
See http://bugs.python.org/issue17290
*/
MSG msg;
PostMessage(0, 0, 0, 0);
GetMessage(&msg, 0, 0, 0);
#endif
debug(L"# about to run: %s\n", launchCommand);
job = CreateJobObject(NULL, NULL);
ok = QueryInformationJobObject(job, JobObjectExtendedLimitInformation,
&info, sizeof(info), &rc);
if (!ok || (rc != sizeof(info)) || !job) {
winerror(0, L"Failed to query job information");
return RC_CREATE_PROCESS;
}
info.BasicLimitInformation.LimitFlags |= JOB_OBJECT_LIMIT_KILL_ON_JOB_CLOSE |
JOB_OBJECT_LIMIT_SILENT_BREAKAWAY_OK;
ok = SetInformationJobObject(job, JobObjectExtendedLimitInformation, &info,
sizeof(info));
if (!ok) {
winerror(0, L"Failed to update job information");
return RC_CREATE_PROCESS;
}
memset(&si, 0, sizeof(si));
GetStartupInfoW(&si);
if (!_safeDuplicateHandle(GetStdHandle(STD_INPUT_HANDLE), &si.hStdInput, L"stdin") ||
!_safeDuplicateHandle(GetStdHandle(STD_OUTPUT_HANDLE), &si.hStdOutput, L"stdout") ||
!_safeDuplicateHandle(GetStdHandle(STD_ERROR_HANDLE), &si.hStdError, L"stderr")) {
return RC_NO_STD_HANDLES;
}
ok = SetConsoleCtrlHandler(ctrl_c_handler, TRUE);
if (!ok) {
winerror(0, L"Failed to update Control-C handler");
return RC_NO_STD_HANDLES;
}
si.dwFlags = STARTF_USESTDHANDLES;
ok = CreateProcessW(NULL, launchCommand, NULL, NULL, TRUE,
0, NULL, NULL, &si, &pi);
if (!ok) {
winerror(0, L"Unable to create process using '%s'", launchCommand);
return RC_CREATE_PROCESS;
}
AssignProcessToJobObject(job, pi.hProcess);
CloseHandle(pi.hThread);
WaitForSingleObjectEx(pi.hProcess, INFINITE, FALSE);
ok = GetExitCodeProcess(pi.hProcess, &rc);
if (!ok) {
winerror(0, L"Failed to get exit code of process");
return RC_CREATE_PROCESS;
}
debug(L"child process exit code: %d\n", rc);
return rc;
}
/******************************************************************************\
*** PROCESS CONTROLLER ***
\******************************************************************************/
int
performSearch(SearchInfo *search, EnvironmentInfo **envs)
{
// First parse the command line for options
int exitCode = parseCommandLine(search);
if (exitCode) {
return exitCode;
}
// Check for a shebang line in our script file
// (or return quickly if no script file was specified)
exitCode = checkShebang(search);
switch (exitCode) {
case 0:
case RC_NO_SHEBANG:
case RC_RECURSIVE_SHEBANG:
break;
default:
return exitCode;
}
// Resolve old-style tags (possibly from a shebang) against py.ini entries
// and environment variables.
exitCode = checkDefaults(search);
if (exitCode) {
return exitCode;
}
// If debugging is enabled, list our search criteria
dumpSearchInfo(search);
// Find all matching environments
exitCode = collectEnvironments(search, envs);
if (exitCode) {
return exitCode;
}
return 0;
}
int
process(int argc, wchar_t ** argv)
{
int exitCode = 0;
int searchExitCode = 0;
SearchInfo search = {0};
EnvironmentInfo *envs = NULL;
EnvironmentInfo *env = NULL;
wchar_t launchCommand[MAXLEN];
memset(launchCommand, 0, sizeof(launchCommand));
if (isEnvVarSet(L"PYLAUNCHER_DEBUG")) {
setvbuf(stderr, (char *)NULL, _IONBF, 0);
log_fp = stderr;
debug(L"argv0: %s\nversion: %S\n", argv[0], PY_VERSION);
}
DWORD len = GetEnvironmentVariableW(L"PYLAUNCHER_LIMIT_TO_COMPANY", NULL, 0);
if (len > 1) {
wchar_t *limitToCompany = allocSearchInfoBuffer(&search, len);
if (!limitToCompany) {
exitCode = RC_NO_MEMORY;
winerror(0, L"Failed to allocate internal buffer");
goto abort;
}
search.limitToCompany = limitToCompany;
if (0 == GetEnvironmentVariableW(L"PYLAUNCHER_LIMIT_TO_COMPANY", limitToCompany, len)) {
exitCode = RC_INTERNAL_ERROR;
winerror(0, L"Failed to read PYLAUNCHER_LIMIT_TO_COMPANY variable");
goto abort;
}
}
search.originalCmdLine = GetCommandLineW();
exitCode = performSearch(&search, &envs);
if (exitCode) {
goto abort;
}
// Display the help text, but only exit on error
if (search.help) {
exitCode = showHelpText(argv);
if (exitCode) {
goto abort;
}
}
// Select best environment
// This is early so that we can show the default when listing, but all
// responses to any errors occur later.
searchExitCode = selectEnvironment(&search, envs, &env);
// List all environments, then exit
if (search.list || search.listPaths) {
exitCode = listEnvironments(envs, stdout, search.listPaths, env);
goto abort;
}
// When debugging, list all discovered environments anyway
if (log_fp) {
exitCode = listEnvironments(envs, log_fp, true, NULL);
if (exitCode) {
goto abort;
}
}
// We searched earlier, so if we didn't find anything, now we react
exitCode = searchExitCode;
// If none found, and if permitted, install it
if (exitCode == RC_NO_PYTHON && isEnvVarSet(L"PYLAUNCHER_ALLOW_INSTALL") ||
isEnvVarSet(L"PYLAUNCHER_ALWAYS_INSTALL")) {
exitCode = installEnvironment(&search);
if (!exitCode) {
// Successful install, so we need to re-scan and select again
env = NULL;
exitCode = performSearch(&search, &envs);
if (exitCode) {
goto abort;
}
exitCode = selectEnvironment(&search, envs, &env);
}
}
if (exitCode == RC_NO_PYTHON) {
fputws(L"No suitable Python runtime found\n", stderr);
fputws(L"Pass --list (-0) to see all detected environments on your machine\n", stderr);
if (!isEnvVarSet(L"PYLAUNCHER_ALLOW_INSTALL") && search.oldStyleTag) {
fputws(L"or set environment variable PYLAUNCHER_ALLOW_INSTALL to use winget\n"
L"or open the Microsoft Store to the requested version.\n", stderr);
}
goto abort;
}
if (exitCode == RC_NO_PYTHON_AT_ALL) {
fputws(L"No installed Python found!\n", stderr);
goto abort;
}
if (exitCode) {
goto abort;
}
if (env) {
debug(L"env.company: %s\nenv.tag: %s\n", env->company, env->tag);
} else {
debug(L"env.company: (null)\nenv.tag: (null)\n");
}
exitCode = calculateCommandLine(&search, env, launchCommand, sizeof(launchCommand) / sizeof(launchCommand[0]));
if (exitCode) {
goto abort;
}
// Launch selected runtime
exitCode = launchEnvironment(&search, env, launchCommand);
abort:
freeSearchInfo(&search);
freeEnvironmentInfo(envs);
return exitCode;
}
#if defined(_WINDOWS)
int WINAPI wWinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance,
LPWSTR lpstrCmd, int nShow)
{
return process(__argc, __wargv);
}
#else
int cdecl wmain(int argc, wchar_t ** argv)
{
return process(argc, argv);
}
#endif
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